/**
 * ***************************************************************************** Copyright (c) 2000,
 * 2011 IBM Corporation and others. All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0 which accompanies this
 * distribution, and is available at http://www.eclipse.org/legal/epl-v10.html
 *
 * <p>Contributors: IBM Corporation - initial API and implementation
 * *****************************************************************************
 */
package org.eclipse.jdt.internal.corext.refactoring.typeconstraints.types;

public final class NullType extends TType {

  protected NullType(TypeEnvironment environment) {
    super(environment, "N"); // $NON-NLS-1$
  }

  @Override
  public int getKind() {
    return NULL_TYPE;
  }

  @Override
  public TType[] getSubTypes() {
    throw new UnsupportedOperationException();
  }

  @Override
  protected boolean doEquals(TType type) {
    return true;
  }

  @Override
  public int hashCode() {
    return 1234;
  }

  @Override
  public String getName() {
    return "null"; // $NON-NLS-1$
  }

  @Override
  protected String getPlainPrettySignature() {
    return getName();
  }

  @Override
  protected boolean doCanAssignTo(TType lhs) {
    int kind = lhs.getKind();
    return kind != PRIMITIVE_TYPE && kind != VOID_TYPE;
  }
}
